JPH10115106A - Crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crusher, in which the quantities of the looseness of a pair of rotating arms are reduced, the maximum opening width of each rotating arm is increased and the durability of a tuning pin tuning and opening and closing each rotating arm is improved. SOLUTION: In the crusher, a pair of rotating arms 1 are attached pivotally to a holding frame body 2 by each pivot shaft 5, both end sections of a circular tuning pin 12 fitted between semicircular recessed sections formed to the opposed end faces of each rotating arm 1 are movably fitted slidably into a slot-shaped guide hole 13 formed to the holding frame body 2, and the direction of movement of the tuning pin 12 at the time of the opening and closing of each rotating arm 1 is controlled in the fixed direction of a center line 15 between each rotating arm by the guide hole 13. Accordingly, clearances among the recessed sections and the tuning pin 12 are reduced and the quantities of looseness are inhibited, and the durability of the tuning pin 12 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing device which is attached to the tip of a swinging arm of a power shovel to crush and disassemble a building such as reinforced concrete with low noise.

[0002]

2. Description of the Related Art As the above-mentioned crushing apparatus, there is known a crushing apparatus in which a pair of rotating arms are opened and closed in a line-symmetric manner by the expansion and contraction operation of a hydraulic cylinder (see Japanese Patent Application Laid-Open No. 2-232470). 5 to 7 show specific examples of the seed crushing apparatus,
This will be described.

The crushing device shown in FIG. 1 is a pair of rotating arms 1 and 1 having a function of cutting and crushing reinforced concrete or the like.
And a holding frame 2 that supports the two so that they can be opened and closed, and a mounting bracket 4 that supports the holding frame 2 so that it can pivot. A pair of rotating arms 1 and 1 has a bearing 1 at a substantially center thereof.
b, 1b are pivotally connected to the common holding frame 2 rotatably on separate pivots 5,5. The tip 1a of each rotating arm 1, 1;
1a protrudes forward of the holding frame 2 and opens and closes to pinch and crush the object to be crushed. The rear ends 1c, 1c of the respective rotating arms 1, 1 extend behind the holding frame 2, and one hydraulic cylinder 6 is bridged between the rear ends 1c, 1c. The hydraulic cylinder 6 includes a cylindrical cylinder body 7 and a piston rod 8. The base end of the cylinder body 7 and the distal end of the piston rod 8 are respectively connected to the rotating arms 1, 1, the rear end 1 c,
1c is rotatably connected to cylinder pins 9 and 9.

The hydraulic cylinder 6 penetrates through the rear part of the holding frame 2, and when the hydraulic cylinder 6 expands and contracts, the respective rotating arms 1 and 1 open and close with the pivots 5 and 5 as fulcrums. The rear end of the holding frame 2 is fixed to the mounting bracket 4 via the turning brake mechanism 3. The mounting bracket 4 is pin-connected to the tip of a swing arm 10 such as a power shovel so as to be able to move up and down. The turning brake mechanism 3 applies a braking force when the entire crushing device mounted in front of the mounting bracket 4 turns in a direction orthogonal to the plane of FIG. 5 to increase the function, versatility, and durability of the crushing device.

As shown in FIGS. 7 (A) to 7 (C), bearing end faces m, m of bearing portions 1b, 1b of a pair of rotating arms 1, 1 are shown.
Is an arc surface equidistant from the center of each of the pivots 5, 5, and concave portions 11, 11 having substantially the same arc are formed at opposite portions of the bearing end surfaces m, m with the same curvature. , 11 are fitted with one circular tuning pin 12 '. The tuning pin 12 ′ is a circular pin having a curvature slightly smaller than the concave portions 11, 11, and is fitted between the concave portions 11, 11 to open and close by a telescopic operation of the hydraulic cylinder 6. 1 are opened and closed in the opposite directions at the same synchronous speed.

That is, FIGS. 5 and 7A show the hydraulic cylinder 6
The piston rod 8 is entering and leaving to the maximum of those obtained while opening the each rotational arm 1,1 to maximum opening width W _2,
At this time, a gap G ₂ is formed between the tuning pin 12 ′ and each of the recesses 11, 11 (for clarity, it is shown larger than the actual size). For example, as shown in FIG. 7A, when each of the rotating arms 1 and 1 is in the up and down position, the tuning pin 12 'moves to the concave portion 11 of the lower rotating arm 1 by its own weight,
The maximum gap G ₂ between the upper rotating arm 1 and the concave portion 11
Is formed.

FIGS. 6 and 7C show the hydraulic cylinder 6.
The piston rod 8 of FIG. 7A is protruded to the maximum and the respective rotating arms 1 and 1 are closed to the maximum. Also in this case, between the tuning pin 12 ′ and the recesses 11, 11, FIG. gap G ₂ similar to gap G ₂ is formed. When each of the rotating arms 1 and 1 is opened from the state shown in FIG. 7C, the two concave portions 11 and 11 are frictionally engaged with the tuning pin 12 'with almost no gap as shown in FIG. 7B. In this case, both the rotating arms 1 and 1 perform an operation of opening in the opposite direction at the same speed in synchronization. Also, when the respective rotating arms 1 and 1 are closed from the state shown in FIG. 7A, both the concave portions 11 and 11 are frictionally engaged with the tuning pin 12 'with almost no gap, so that both the rotating arms 1 and 1 are closed. The operation of closing in the opposite direction at the same speed is performed synchronously.

As described above, the pair of rotating arms 1 and 1 are tuned by the tuning pin 12 'to open and close, so that even when a load greater than the other is applied to both, the two open and close in the same manner. The crushing operation of the crushed material becomes easy,
The durability of the crusher can be increased.

[0009]

By the way, a pair of each time
When the moving arms 1 and 1 are closed,
Even if the gap of the rotation arm 12 ′ is set to be minute,
The larger the gap is, the larger the gap becomes. As shown in FIG.
The gap G when the moving arms 1 and 1 are opened to the maximum _TwoIs the best
It will be great. This gap G_TwoThe larger the
The moving arms 1 and 1 freely rotate around the respective pivots 5 and 5 as fulcrums
The degree of freedom of the rotation arm 1
The attachment amount increases. Therefore, each rotating arm 1, 1
If you open it wide, the gap G_TwoEach time it grows
The moving arms 1 and 1 are loose and difficult to handle
Therefore, the crushing operability of a large crushed material was deteriorated. Ma
Considering these crushing operability, each of the rotating arms 1, 1
Opening width W of_TwoIs limited to a small
Failure to increase the maximum size of the crushed material
was there.

Further, when the closing operation in a state in which the large gap G ₂ is, 'contact condition with becomes unbalanced, the tuning pin 12 of the recess 11, 11' with respect to the amount of wear at work act prying the tuning pins 12 Increase. Thus the larger the gap G _2, a high probability to frictionally engage the tuning pin 12 'biased toward one of the recesses 11, 11 of the pair of pivot arms 1, 1, tuned in this biased frictional engagement Pin 12 '
Was often worn out early and deformed, resulting in a short life. In fact, when one construction work at one construction site is completed, the wear of the tuning pin is so severe that it is often necessary to replace it with a new one. Such a replacement operation of the tuning pin is difficult and takes a long time because the crushing device itself is a heavy material, and the workability at the construction site is deteriorated.

An object of the present invention is to reduce the amount of looseness of a pair of rotating arms, to increase the maximum opening width of each rotating arm, and to synchronize each rotating arm to open and close it. To provide a crushing device with improved durability.

[0012]

According to the present invention, a pair of rotating arms are pivotally connected to a holding frame by separate pivots so as to be openable and closable by the expansion and contraction of a hydraulic cylinder, and are located at the same distance from each pivot. In a crushing device in which a circular tuning pin that opens and closes both rotating arms in the opposite direction at the same synchronous speed is fitted between substantially semicircular concave portions formed opposite to the end faces of both rotating arms. ,
Both ends of the tuning pin are loosely fitted to the holding frame, and a guide hole is formed to regulate the moving direction of the tuning pin in opening and closing the two rotating arms in the direction of the center line between the two rotating arms. The purpose is achieved.

Here, the hydraulic cylinder for opening and closing the pair of rotating arms may be either one common to both rotating arms or two hydraulic cylinders for opening and closing each of both rotating arms independently. The guide holes formed in the holding frame are elongated through holes or slots in the direction of the center line between the pair of rotating arms, and both ends of the tuning pin are slidably inserted into the guide holes. When fitted, the direction of movement of the tuning pin when the pivoting arm is opened and closed is regulated in the direction of the center line between the pivoting arms. Due to the regulation of the movement direction of the tuning pin, the tuning pin is always located in the middle of the pair of recesses formed opposite to the end faces of the pair of rotary arms, and the frictional engagement is performed under equal conditions without being biased by the recesses. Accordingly, wear and deformation of the tuning pin are suppressed. Further, by regulating the position of the tuning pin by the guide hole of the holding frame, it is possible to set a small gap between the concave portion of each rotating arm opened with the maximum opening width and the tuning pin. The maximum opening width can be increased.

[0014] Further, in order to further stabilize the posture when the pair of rotating arms are opened with the maximum opening width, the present invention provides:
When the pair of pivot arms are opened to a predetermined opening width, a pair of stoppers that come into contact with each pivot arm and regulate the maximum opening width are formed integrally with the holding frame.

Here, the pair of stoppers of the holding frame are
It may be a claw-shaped member integrally projecting from both sides of the rear end of the holding frame, and the rear end abuts on the tip of each stopper of the holding frame when each rotating arm is opened to the maximum opening width. By the stopper of the holding frame, the amount of backlash when each rotating arm is opened at the maximum opening width becomes substantially zero, and the crushing operability by the rotating arm is improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS. This embodiment is applied to the crushing apparatus shown in FIGS. 5 to 7, and the same or corresponding parts as those in FIGS.

The device of the present invention is different from the conventional device in that both ends of the tuning pin 12 fitted between the concave portions 11 formed in the bearing end surfaces m, m of the pair of rotating arms 1, 1 are held by the holding frame. That is, it is slidably loosely fitted in the guide hole 13 formed in the body 2. Further, when different from the conventional apparatus of the present invention apparatus, the rear end portion of the holding frame 2, a pair of pivot arms 1, 1 is each rotational arm 1,1 when opened at the maximum opening width W ₁ That is, a pair of stoppers 14, 14 with which the rear ends abut, are integrally provided.

The bearing portions 1b, 1 of the pair of rotating arms 1, 1
b is rotatably connected to the common holding frame 2 by separate pivots 5, 5, and one hydraulic cylinder 6 is installed between the rear ends 1 c, 1 c of the respective rotating arms 1, 1. Cylinder 6
The pivoting arms 1 and 1 pivot about the pivots 5 and 5 to open and close. The rear end of the holding frame 2 is fixed to the mounting bracket 4 via the turning brake mechanism 3. The mounting bracket 4 is pin-connected to the tip of a swing arm 10 such as a power shovel so as to be able to move up and down.

As shown in FIGS. 3 (A) and 3 (B), a substantially semicircular shape is formed on the bearing end surfaces m, m of an arc surface equidistant from the center of each of the pivots 5, 5 of the pair of pivot arms 1, 1. Arcuate recess 11,
11 is formed, and one circular tuning pin 12 is fitted between the pair of recesses 11, 11. The pair of rotating arms 1 and 1 are arranged symmetrically on both sides of a center line 15 between the two rotating arms 1 and 1 passing through an intermediate point between the pivots 5 and 5, and the center of the tuning pin 12 is aligned with the center line. 15 above.

The guide hole 13 of the holding frame 2 is
, Each of which has a recess 1
The center line is located at both ends of the tuning pin 12 fitted between 1 and 11
It is slidably supported in 15 directions. Total length of guide hole 13
Means that the pair of pivot arms 1 and 1 are closed and the maximum opening width
W₁In accordance with the movement stroke of the tuning pin 12 during opening
Is set. That is, FIG. 1 and FIG.
The maximum opening width W ₁This is when opened with
When the recesses 11 and 11 and the tuning pin 12 are in the forefront position,
Both ends of the tuning pin 12 are located on the front end side of the guide hole 13.
Go to FIG. 2 and FIG. 3 (B) show each rotating arm.
1 and 1 are closed.
1 and the tuning pin 12 are at the rearmost position,
The two end portions 2 move to the rear end side of the guide hole 13.

When the pair of turning arms 1 and 1 open and close, the tuning pin 12 is positioned at the guide hole 13 so that the center of the tuning pin 12 moves on the center line 15 between the turning arms 1 and 1. It is regulated and moves back and forth. Therefore, when the pair of rotating arms 1 and 1 are opened and closed, the tuning pin 12 always moves back and forth while being held at an intermediate position between the concave portions 11 and 11, and moves the rotating arms 1 and 1 to the center line 15. Open and close in opposite directions at the same speed on both sides.

The tuning pin 1 with such a guide hole 13
2, the rotation arms 1, 1
Can equalized to minimize the gap G ₁ between the recesses 11, 11 and the tuning pin 12, thereby rattling of each rotational arm 1,1 during opening is prevented. Moreover, the reduction of the gap G _1, it is possible to increase the maximum opening width W ₁ of each rotational arm 1,1. Further, since the guide hole 13 holds the tuning pin 12 at a substantially intermediate position between the recesses 11, 11, the tuning pin 12 always frictionally engages equally without biasing to the recesses 11, 11. Wear and deformation of the tuning pin 12 are suppressed, and the durability is greatly increased.

The maximum opening width W of each of the rotary arms 1 and 1
₁Is increased, the clearance G ₁By each pivot
A situation where the backlash of the programs 1 and 1 cannot be ignored
To prevent this from happening.
Forming a pair of stoppers 14 on the holding frame 2
Is desirable. The pair of stoppers 14 and 14 are the holding frame 2
For example, an L-shaped claw piece integrally protruded from the rear end portion. This
Corresponding to the stoppers 14, 14 of the rotary arm 1,
Projection pieces 1d, 1d are integrally protruded from the rear end portions 1c, 1c.
Then, each of the rotating arms 1, 1 has a maximum opening width W.₁Opened until
Sometimes, the tips of the projection pieces 1d, 1d are
So that it touches the tip of This way each time
The moving arms 1 and 1 have the maximum opening width W₁Each rotation when opened with
The opening amounts of the arms 1 and 1 are adjusted equally, and the opening amounts are uneven.
The play of each rotating arm 1, 1 is suppressed with the backlash associated with
The power is stable and the workability of crushing the material to be crushed is good.
Become.

Next, a specific example of the assembling structure of the crushing apparatus according to the above embodiment will be described with reference to FIG. 4. The cutter 20 is provided with a bolt 21, a spring washer 22 and a nut at the tip 1 a of the rotating arm 1 as necessary. 23 is fixed. The pivot 5 is a bush 24 and an O-ring 2 in the holding frame 2.
5. The grease nipple 27 is attached to the pivot 5 by being inserted through the pin stopper 26. A tuning pin 12 is inserted into a guide hole 13 formed as a through hole in both side walls of the holding frame 2.
The grease nipple 28 and the pin stopper 29 are attached to both ends thereof, and the pin stopper 29 is fixed to the holding frame 2 with bolts 30.

The central portion of the holding frame 2 has a box shape, and a hydraulic cylinder 6 is installed near the rear of the holding frame 2.
The end of the hydraulic cylinder 6 and the rear end 1c of the rotary arm 1
The cylinder pin 9 has a retainer 31, a pin lock 32,
The bush 35 and the seal 36
3, 34 attached.

The present invention is not limited to the above embodiment, but is also applicable to, for example, a crusher in which a pair of rotating arms are individually opened and closed by two hydraulic cylinders.

[0027]

According to the crushing device of the first aspect, the direction of movement of the tuning pin, which moves back and forth by opening and closing the pair of rotating arms, is regulated by the guide hole of the holding frame toward the center line between the rotating arms. Therefore, it is possible to sufficiently reduce the curvature of the concave portion in which the tuning pin of each rotating arm is fitted to about the circumferential curvature of the tuning pin. By setting the gap between the concave portion and the tuning pin to be small, it is possible to suppress the amount of backlash of each rotating arm at the time of maximum opening, thereby minimizing the occurrence of unevenness of the opening amount of each rotating arm, The impact on the tuning pin during opening and closing of the arm can be reduced, the operability when the rotating arm is opened is improved, and the maximum opening width of each rotating arm can be increased. High-performance crush that can crush Apparatus can be provided. Further, the guide hole of the holding frame holds the tuning pin at a substantially intermediate position between the concave portions of the respective rotating arms, so that the tuning pin is always frictionally engaged with each concave portion equally, so that wear and deformation of the tuning pin are suppressed. Life can be easily extended.

According to the crushing device of the second aspect, when the pair of rotating arms are opened with the maximum opening width, the rotating arms come into contact with the stoppers of the holding frame, and the maximum opening amount of each rotating arm is reduced. Equally adjusted, rattling due to uneven opening amount is more reliably suppressed, so that handling when each rotating arm is opened to the maximum is easier, and the maximum opening width of each rotating arm is larger. It can be set.

[Brief description of the drawings]

FIG. 1 is a side view including a partial cross section when a rotating arm is opened, showing an embodiment of the present invention.

FIG. 2 is a side view of the apparatus in FIG. 1 when a rotating arm is closed.

3 (A) is a partially enlarged cross-sectional view of the apparatus in FIG. 1, and FIG.
(B) is a partial enlarged sectional view of the apparatus in FIG. 2.

FIG. 4 is an exploded perspective view of the apparatus in FIG. 1;

FIG. 5 is a side view of the conventional crushing device when the rotating arm is opened.

FIG. 6 is a side view of the device of FIG. 5 when the rotating arm is closed.

7 (A) to 7 (C) are partially enlarged sectional views of the apparatus in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating arm 2 Holding frame 5 Axis 6 Hydraulic cylinder 11 Recess 12 Tuning pin 13 Guide hole 14 Stopper 15 Center line

Claims (2)

[Claims] 1. A pair of rotating arms are pivotally connected to a holding frame by separate pivots by opening and closing movement of a hydraulic cylinder so as to be openable and closable. In a crushing device in which a circular tuning pin that opens and closes both rotating arms in the same direction at the same synchronous speed is fitted between substantially semicircular concave portions formed and provided, the tuning pin is fixed to the holding frame. A crushing device, wherein both ends of the rotary arm are loosely fitted to form a guide hole for restricting the direction of movement of the tuning pin when the two rotary arms are opened and closed in the direction of the center line between the two rotary arms. 2. A pair of stoppers, which are formed integrally with the holding frame, to abut against each of the pivot arms when the pair of pivot arms are opened to a predetermined opening width to regulate the maximum opening width. The crushing device according to claim 1, wherein the crushing device is used.